水基型氯氰菊酯微乳剂的性质和铺展动力学

doi:10.3866/PKU.WHXB201211302

Abstract

Abstract:

Water-based cypermethrin microemulsions were prepared by adding oil to emulsified water, with ethyl butyrate as the solvent, TritonX-100 (TX-100) and sodium dodecyl benzene sulfonate (SDBS) as surfactants, and n-butyl alcohol (n-C₄H₉OH) as a co-surfactant. The structure and properties of the microemulsions were investigated by determining the phase diagram, and using negative-staining transmission electron microscopy, and conductivity, surface tension, dynamic light scattering, and contact angle measurements. The spreading kinetics of the microemulsions on the leaf surface of Youngfu wheat was also studied. The results showed that the cypermethrin microemulsions followed the oil-in-water model, and had a strong solubilizing effect on cypermethrin. The microemulsions showed a low contact angle, and low surface tension, and the droplet radius was about 45 nm. The kinetics for the spreading of the microemulsions on the leaf surface of Youngfu wheat fitted a second-order kinetic equation. The kinetic rate constants were 0.1090 (°)^-1·min^-1 (20℃) and 0.1572 (°)^-1·min^-1 (30℃), and the activation energy was 27.03 kJ·mol^-1.

Key words: Cypermethrin, Microemulsion, Oil in water, Contact angle, Spreading kinetics

ZHANG Long, HAN Jing-Jing, LI Jia-Jia, LIU Tian-Qing. Properties and Spreading Kinetics of Water-Based Cypermethrin Microemulsions[J].Acta Phys. -Chim. Sin., 2013, 29(02): 346-350.

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Properties and Spreading Kinetics of Water-Based Cypermethrin Microemulsions

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